EP1943807B1 - Method for generating and demultiplexing an optimized contributing signal, and regionalized data broadcasting system - Google Patents

Method for generating and demultiplexing an optimized contributing signal, and regionalized data broadcasting system Download PDF

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Publication number
EP1943807B1
EP1943807B1 EP06819076.8A EP06819076A EP1943807B1 EP 1943807 B1 EP1943807 B1 EP 1943807B1 EP 06819076 A EP06819076 A EP 06819076A EP 1943807 B1 EP1943807 B1 EP 1943807B1
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EP
European Patent Office
Prior art keywords
services
signal
packets
multiplex
optimised
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EP06819076.8A
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German (de)
French (fr)
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EP1943807A1 (en
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Benoît OGER
Eric Lebars
Richard Lhermitte
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THOMSON LICENSING
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Thomson Licensing SAS
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6156—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network
    • H04N21/6193—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network involving transmission via a satellite
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
    • H04N21/23412—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs for generating or manipulating the scene composition of objects, e.g. MPEG-4 objects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • H04N21/23608—Remultiplexing multiplex streams, e.g. involving modifying time stamps or remapping the packet identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/262—Content or additional data distribution scheduling, e.g. sending additional data at off-peak times, updating software modules, calculating the carousel transmission frequency, delaying a video stream transmission, generating play-lists
    • H04N21/26208—Content or additional data distribution scheduling, e.g. sending additional data at off-peak times, updating software modules, calculating the carousel transmission frequency, delaying a video stream transmission, generating play-lists the scheduling operation being performed under constraints
    • H04N21/26216—Content or additional data distribution scheduling, e.g. sending additional data at off-peak times, updating software modules, calculating the carousel transmission frequency, delaying a video stream transmission, generating play-lists the scheduling operation being performed under constraints involving the channel capacity, e.g. network bandwidth

Definitions

  • the invention relates to a method for generating and demultiplexing contributions. More particularly, the invention makes it possible to optimize the bandwidth necessary to broadcast, in bursts of data via, in particular, a satellite link, services with global distribution and services with regional distribution.
  • the invention applies in particular to a multi-regional broadcasting of burst data services.
  • the invention also relates to a regionalised data broadcast system.
  • the broadcasting of services to mobile receivers includes a step of generating the contribution signal and a step of reception and re-transmission of services by regional terrestrial transmitters.
  • the contribution signal is for example routed to the different regions via a satellite contribution link.
  • the bandwidth available on a satellite is particularly limited and therefore expensive.
  • the broadcasting of services to mobile receivers may use successive burst data dissemination techniques, as proposed for example by the DVB-H standard. This technique makes it possible to realize at the level of the receivers substantial energy savings.
  • the current means make it possible to broadcast services to mobile receivers by optimizing the bandwidth used on the contribution link.
  • Such systems do not manage a contribution link delivering broadcast and regional services to multiple terrestrial networks spread across multiple geographic areas and whose data is burst.
  • regional and global broadcast data for each region leads to redundancy of global broadcast information and suboptimal use of satellite resources.
  • the broadcasting of burst services is usually done through a single frequency network infrastructure (or the English expression Single Frequency Network).
  • the terrestrial transmitters broadcasting the regional services must be synchronized.
  • the receivers receive synchronization information from the contribution link in the form of synchronization frames or according to the expression Mega-frame Initialization Packet forming the acronym MIP.
  • MIP Mega-frame Initialization Packet
  • the broadcasting of global and regional services in bursts over several regions must therefore restore the MIP frames received without altering the accuracy thereof.
  • Each MIP frame, inserted regularly in the stream delivers a time reference between the stream and a reference clock. In this way, gaps and jitter can be eliminated between transfer times from the satellite to different regions.
  • Equipment suitable for insertion of MIP frames can properly insert the MIP frames in a flow whose flow is known and constant between the moment the flow is sent and the moment when the flow is received.
  • the bit rate of the contribution signal may be different from the bit rate of the signal broadcast in a given geographical region, certain services may not concern certain regions. Since the bit rate is different between the signal transmitted on the contribution link and the signal received by the transmitters, the values included in the MIP frames inserted by a device adapted to the insertion of MIP frames are incorrect.
  • the purpose of the invention is in particular to overcome the aforementioned drawbacks.
  • the subject of the invention is a method for generating an optimized contribution signal comprising multiplexes.
  • the stuffing packets and the packets carrying the signaling tables are marked by operating a translation of the identifier of said stuffing packets and packets carrying the signaling tables.
  • the data bursts of the optimized contribution signal can be constructed initially for all global broadcast services and then as a second step for all regional services.
  • the optimized contribution signal may include synchronous data bursts whose period and rate are identical.
  • the identifier of the marked stuffing packets and the marked packets carrying the signaling tables are translated so as to reconstitute the data streams corresponding to the services intended to the geographical area.
  • the method may also include a step of smoothing the rate of the signal constructed in the step of constructing data bursts.
  • the system is provided for broadcasting the multiplexes over a coverage area including geographic regions. Each geographic region receives at least one multiplex.
  • the system includes receivers distributed in different geographical regions and adapted to receive said transmitted optimized signal in the coverage area. Each receiver is able to generate from the optimized contribution signal a signal to be sent for the geographical region in which said receiver is located.
  • the signal to be transmitted is transmitted by transmission means over the entire geographic region in which the transmission means are located.
  • the transmission means form a single frequency network and are synchronized. At least a portion of said receivers are intended to implement a signal demultiplexing method according to the signal demultiplexing method according to the invention.
  • the invention also relates to a receiver comprising a processing unit, an input and an output.
  • the input is provided to receive an optimized contribution signal including data relating to at least one multiplex.
  • Each multiplex includes global broadcast and regional services, stuffing packets and packets carrying signal tables labeled according to their membership multiplex.
  • the processing unit is intended to construct a signal sent on the output by: - retaining only the services intended for said geographical region; - constructing data bursts from the data streams included in the corresponding optimized contribution signal: o to global broadcast services; o regional services for that geographical area; o labeled jam packets and tagged packets carrying the signaling tables corresponding to the regional services intended for said geographic region.
  • Said receiver is preferably intended to implement a signal demultiplexing method according to the signal demultiplexing method according to the invention.
  • the figure 1 represents an architecture of the regionalised data broadcasting system according to the invention.
  • the regionalized data broadcasting system according to the invention comprises a part whose function is to generate a contribution signal.
  • Content sources 1 generate data streams.
  • Content sources 1 may for example be file servers, control rooms, readers or any other equipment delivering content.
  • the data streams generated may be for example IP data streams.
  • the different data streams contain different services or programs. Among the services included in the data streams are regional services 3 to be broadcast only in certain geographic areas 9 and broadcast services 2, such as national services.
  • An encapsulator 4 receives the data streams corresponding to the regional services 3 and the global broadcast services 2.
  • the encapsulator 4 receives the data streams, for example the IP data streams, and constructs the signals intended for each of the different geographical regions.
  • the signal constructed by the encapsulator 4 for a given geographical region 9 is a multiplexed signal, also called a multiplexed signal, comprising all the data streams corresponding to the regional services 3 specific to this geographical region
  • the encapsulator 4 can in particular support the creation of successive data bursts for all regional services 3 and global broadcasting 2.
  • a stream of data transmitted in a burst comprises alternating transmission phases of a train of data. data followed from phase of silence of a duration known a priori.
  • the discontinuous sending of data allows the equipment receiving a stream of data transmitted in a burst to go to sleep during silent times, and to resume reception a little before the start of reception of the next data stream, mechanism made possible by knowledge of the time of issue of the next packet.
  • the DVB-H standard describes such a mode of operation, with the objective of saving the energy sources of the receivers.
  • the encapsulator 4 can comply with the requirements of the DVB-H standard.
  • the signals intended for each of the different geographical regions 9 then comprise burst data services. It is also possible to obtain at the output of the encapsulator 4 multiplexed signals comprising both successive burst broadcast services and multiplex broadcast services.
  • the encapsulator 4 can still have the function of rearranging the various multiplexed signals before broadcasting in order to optimize the necessary bandwidth.
  • the encapsulator 4 can still insert in the different signals frames having synchronization information to the receiving equipment.
  • encapsulator 4 can insert MIP frames.
  • the MIP frames contain the information necessary to complete the synchronization between the transmission means 12.
  • Equipment, called MIP-Inserter know how to correctly insert MIP frames in a stream.
  • MIP-Inserter know how to correctly insert MIP frames in a stream.
  • the generation of MIP frames can be implemented at the level of the construction of the data streams intended for the different geographical regions 9, before the construction of the contribution signal.
  • This implementation is possible because the encapsulator 4 can itself be synchronized to an external clock type GPS. Since the region-based data delivery system of the invention ensures the integrity of the data streams received in each geographic region 9, the MIP frames will still be valid.
  • the multiplexed signals from the encapsulator 4 are then transmitted to a modulator 5 responsible for adapting the signals to the constraints of the transmission channels. It can for example modulate the received signals before transmitting them to an antenna 6 for broadcasting to a satellite system 8.
  • the satellite system 8 comprises one or more satellites.
  • the signal transmitted to the satellite system 8 via the antenna 6 is called the contribution signal 7.
  • the bandwidth available for the contribution signal 7 is particularly expensive and limited.
  • the object of the invention is in particular to reduce the bandwidth requirement for the contribution signal 7.
  • the satellite system 8 broadcasts on a coverage area 10 the contribution signal 7.
  • the coverage zone 10 comprises in particular several geographical regions 9.
  • each geographic region 9 is present at least one receiver 11 coupled to transmission means 12.
  • Each receiver 11 receives the signal from the satellite system 8 and if necessary the demodule. This signal is identical in the coverage area 10 for all the receivers 11, regardless of the geographical region 9 of the reception site.
  • the receiver 11 extracts the services intended for the geographic region 9 in which it is located.
  • the services extracted are therefore only the global broadcast services 2 and the regional services 3 intended for the geographical region 9 of the receiver 11.
  • the extracted services are indifferently bursty services, multiplexed broadcast services or any combination whatsoever both types of services.
  • the data streams corresponding to the services extracted may conform to the DVB-H standard.
  • the receiver 11 transmits the extracted services to the transmission means 12.
  • the transmission means 12 have the function of broadcasting the extracted services over their entire geographic region 9.
  • the transmission means 12 may in particular be microwave transmitters distributed over the region. The whole of the geographical region 9.
  • the transmission means 12 may form a single frequency network (or the Anglesaxonne Single Frequency Network).
  • the transmission means 12 of the coverage area 10 must then be synchronized in order to exclude mutual interference. To do this, the transmission means 12 synchronize using the MIP frames generated for example by the encapsulator 4.
  • the MIP frames contain the information necessary to accomplish the synchronization between the transmission means 12.
  • the figure 1 illustrates an architecture of the regionalized data broadcasting system according to the invention implementing a signal of contribution 7 broadcast by a satellite system 8.
  • any other broadcasting medium whose bandwidth needs to be optimized can be used to fulfill this function.
  • the figure 2a shows the steps implemented by a method according to the invention for generating an optimized contribution signal.
  • the figure 2b shows the different data streams before and after the implementation of the method according to the invention for multiplexing contributions. Elements identical to the elements already presented in the other figures bear the same references.
  • the method according to the invention can in particular be implemented in the part of a regionalised data broadcasting system according to the invention, one of whose functions is to generate an optimized contribution signal.
  • the method according to the invention for generating an optimized contribution signal receives in input at least one global broadcast service 2 and regional services 3.
  • the multiplexed signal 35 is then called the set of all global broadcast services. 2 and regional services 3 for a given geographic area.
  • the method according to the invention receives for each geographical region 9 a multiplex 35.
  • the method according to the invention delivers an optimized contribution signal 36 at the output.
  • figure 2b illustrates the case where the method according to the invention receives at input three multiplexes 35 and outputs an optimized contribution signal 35.
  • the data flow charts include an x-axis 21 representing the time and an ordinate axis 20 representing the flow rate of the data streams.
  • the method according to the invention for multiplexing contributions is intended in particular to reduce the bandwidth required to broadcast the regional services of the different regions 9 and to deliver an optimized contribution signal 36 from which each receiver 11 can find the regional services 3 which are intended for him.
  • the constraints related in particular to the broadcast of services meeting the DVB-H standard require to respect a synchronization between the transmitter and the receiver of the service does not tolerate any insertion or removal of information bits in the signal.
  • the figure 2b shows a case where the rate of stuffing packets is constant. However, the rate may be variable over time and different from one multiplex to another.
  • a step 31 for marking stuffing packets the stuffing packs 26,27,28 are marked according to their multiplex 35 of belonging.
  • This operation serves to associate a stuffing packet 26, 27, 28 to a given multiplex 35.
  • This operation can for example be implemented by operating a translation of the identifier Pid of the stuffing packets 26, 27, 28.
  • a step 32 for marking the packets carrying the signaling tables the packets carrying the signaling tables 26, 27, 28 are labeled according to their membership multiplex.
  • This operation serves to associate packets carrying the signaling tables 26,27,28. at a given multiplex 35.
  • This operation may for example be implemented by performing a translation of the identifier Pid of the packets carrying the signaling tables 26,27,28.
  • a data flow is constructed in particular from the data streams generated in steps 30, 31 and 32.
  • the data flow notably comprises a data flow corresponding to the global broadcast service. 22, burst of data corresponding to the regional services 23, 24 and 25, labeled jam packets and tagged packets carrying the signaling tables 26,27,28. The remaining bandwidth can be filled by stuffing packs 30, especially if the regional services 23, 24, 25 do not have identical rates.
  • the generation of the optimized contribution signal 36 groups the services according to whether they are regional 3 or global broadcast 2. Thus, for each burst, the global broadcast service 22 is transmitted before the regional services 23, 24 and 25. Further, the optimized contribution signal 36 includes synchronous data bursts whose period and rate are identical.
  • the period and the data burst rate corresponding to the regional services 23, 24 and 25 are identical.
  • the burst of data corresponding to the regional services 23, 24 and 25 are synchronous: they are transmitted at the same time.
  • the generation rate of each multiplex 35 must correspond to the transmission rate by the transmission means 12 on the terrestrial network.
  • synchronization information is introduced into the optimized contribution signal 36.
  • This synchronization information can for example take the form of MIP frames.
  • the MIP frames contain the information necessary to accomplish the synchronization between transmission means 12 including.
  • FIG 3a shows the steps implemented by a method according to the invention of demultiplexing contributions. Elements identical to the elements already presented in the other figures bear the same references.
  • One of the roles of the receivers 11 is to extract from the optimized contribution signal 36 the original multiplex 35 intended for their geographical region 9.
  • the method according to the invention of demultiplexing the contributions may notably be implemented in each receiver 11 receiving an optimized contribution signal 36 generated by a method according to the invention for multiplexing contributions.
  • the method according to the invention for demultiplexing the contributions receives the optimized contribution signal 36.
  • the optimized contribution signal 36 comprises all the regional services 23, 24, 25 and global distribution 22.
  • the optimized contribution signal 36 is filtered in order to keep only the services intended for a given geographic region 9. Packets that are not intended for the geographic region 9, to which the receiver 11 belongs, are deleted. Unmarked jam packets are also deleted.
  • the multiplex 35 is regenerated. For this, it is necessary not only to reconstitute the data flows corresponding to the services intended for a given geographic region 9, but also to reconstruct the packets of stuffing and the packets carrying the signaling tables specific to a given multiplex. It is possible, for example, to translate, in the opposite manner to the stage 31 and 32 of the method according to the invention of multiplexing the contributions, the identifier Pid of the stuffing packets and the packets carrying the signaling tables 26,27,28 according to their membership multiplex.
  • bit rate at which the global broadcast services 2 are received is generally greater than the bit rate of the transmission means 12.
  • bit rate of the signal to be transmitted 46 is smoothed.
  • the flow smoothing operation 43 may be implemented via data buffers to absorb and smooth the fluctuating flow rate of packets.
  • step 44 the signal 46 obtained at the output of step 43 smoothing the flow of the method according to the invention for demultiplexing the contributions is then re-transmitted locally, that is to say in the geographical area 9 of the transmission means 12.
  • the steps 41, 42, 43 of the method according to the invention for receiving and regenerating a multiplex 35 are carried out by a DVB-H modulator, used for example by the transmission means 12. so that the receiver 11 has, apart from pure satellite reception, only very simple tasks to perform and little need in memory.
  • a DVB-H modulator used for example by the transmission means 12.
  • the figure 4 illustrates by a block diagram an embodiment of the receiver 11 according to the invention.
  • the elements identical to the elements already presented in the other figures bear the same references.
  • the receiver 11 comprises in particular a processing unit 61.
  • the processing unit 61 may be an electronic card comprising one or more microprocessors, a programmable logic component, or any other device adapted in particular to numerical calculations.
  • the receiver 11 receives on an input 60 an optimized contribution signal 36 comprising data relating to at least one multiplex 35.
  • Each multiplex comprises global broadcast services 22 and regional 23, 24 and 25, packets of stuffing and packets carrying signaling tables 26,27,28 labeled according to their membership multiplex.
  • the processing unit 61 of the receiver 11 constructs a signal sent on an output 62 by implementing the steps of the method according to the invention of demultiplexing the contributions (illustrated in particular by the figure 3a ).
  • the output 62 may in particular be connected to the transmission means 12.

Description

L'invention concerne un procédé de génération et démultiplexage de contributions. Plus particulièrement, l'invention permet d'optimiser la bande passante nécessaire pour diffuser, en rafales de données via notamment un lien satellite, des services à diffusion globale et des services à diffusion régionale. L'invention s'applique notamment à une diffusion multi-régionale de services en rafales de données. L'invention a encore pour objet un système de diffusion régionalisée de données.The invention relates to a method for generating and demultiplexing contributions. More particularly, the invention makes it possible to optimize the bandwidth necessary to broadcast, in bursts of data via, in particular, a satellite link, services with global distribution and services with regional distribution. The invention applies in particular to a multi-regional broadcasting of burst data services. The invention also relates to a regionalised data broadcast system.

La diffusion de services à destination de récepteurs mobiles, comme par exemple des téléphones portables ou des assistants personnels, comporte notamment une étape de génération du signal de contribution et une étape de réception et de ré-émission des services par des émetteurs terrestres régionaux. Le signal de contribution est par exemple acheminé vers les différentes régions via un lien de contribution satellite. Or, la bande passante disponible sur un satellite est particulièrement limitée et donc coûteuse.The broadcasting of services to mobile receivers, such as cell phones or PDAs, includes a step of generating the contribution signal and a step of reception and re-transmission of services by regional terrestrial transmitters. The contribution signal is for example routed to the different regions via a satellite contribution link. However, the bandwidth available on a satellite is particularly limited and therefore expensive.

La diffusion de services à destination de récepteurs mobiles peut avoir recours à des techniques de diffusion de données en rafales successives, comme le propose par exemple la norme DVB-H. Cette technique permet de réaliser au niveau des récepteurs des économies d'énergie substantielles. Les moyens actuels permettent de diffuser des services à destination de récepteurs mobiles en optimisant la bande passante utilisée sur le lien de contribution. Cependant, de tels systèmes ne gèrent pas de lien de contribution délivrant des services à diffusion globale et des services régionaux à plusieurs réseaux terrestres répartis sur plusieurs zones géographiques et dont les données sont diffusées en rafales. Pour diffuser des services globaux et régionaux en rafales sur plusieurs régions, il est nécessaire de diffuser pour chaque région les services globaux et des services régionaux spécifiques. Aussi l'émission, pour chaque région, de données à diffusion régionale et globale conduit à une redondance des informations à diffusion globale et à une utilisation des ressources satellites sous-optimale.The broadcasting of services to mobile receivers may use successive burst data dissemination techniques, as proposed for example by the DVB-H standard. This technique makes it possible to realize at the level of the receivers substantial energy savings. The current means make it possible to broadcast services to mobile receivers by optimizing the bandwidth used on the contribution link. However, such systems do not manage a contribution link delivering broadcast and regional services to multiple terrestrial networks spread across multiple geographic areas and whose data is burst. In order to broadcast global and regional services in multiple regions, it is necessary to disseminate global services and specific regional services for each region. Also, regional and global broadcast data for each region leads to redundancy of global broadcast information and suboptimal use of satellite resources.

La diffusion de services globaux et régionaux en rafales de données sur plusieurs régions se heurte à la complexité de la reconstitution du flux d'origine après l'étape de réception du signal de contribution.The distribution of global and regional data burst services across multiple regions is hampered by the complexity of restoring the original flow after the receive signal stage.

En outre, la diffusion de services en rafales se fait habituellement grâce à une infrastructure réseaux à fréquence unique (ou selon l'expression anglo-saxonne Single Frequency Network). Les émetteurs terrestres diffusant les services régionaux doivent être synchronisés. Pour cela les récepteurs reçoivent des informantions de synchronisation provenant du lien de contribution sous forme de trames de synchronisation ou selon l'expression anglo-saxonne Mega-frame Initialization Packet formant l'acronyme MIP. La diffusion de services globaux et régionaux en rafales sur plusieurs régions doit donc restituer les trames MIP en réception sans altérer la précision de celles-ci. Chaque trame MIP, insérée régulièrement dans le flux, délivre une référence temporelle entre le flux et une horloge de référence. Ainsi on peut éliminer les écarts et la gigue entre les temps de transfert depuis le satellite jusqu'aux différentes régions. Des équipements adaptés à l'insertion de trames MIP, peuvent insérer correctement les trames MIP dans un flux dont le débit est connu et constant entre le moment où le flux est envoyé et le moment où le flux est reçu. Cependant il n'est pas possible de les utiliser dans un contexte de contribution. En effet le débit du signal de contribution peut être différent du débit du signal diffusé dans une région géographique donnée, certains services pouvant ne pas concerner certain région. Le débit étant différent entre le signal émis sur le lien de contribution et le signal reçu par les émetteurs, les valeurs comprises dans lés trames MIP insérées par un équipement adapté à l'insertion de trames MIP sont incorrectes.In addition, the broadcasting of burst services is usually done through a single frequency network infrastructure (or the English expression Single Frequency Network). The terrestrial transmitters broadcasting the regional services must be synchronized. For this, the receivers receive synchronization information from the contribution link in the form of synchronization frames or according to the expression Mega-frame Initialization Packet forming the acronym MIP. The broadcasting of global and regional services in bursts over several regions must therefore restore the MIP frames received without altering the accuracy thereof. Each MIP frame, inserted regularly in the stream, delivers a time reference between the stream and a reference clock. In this way, gaps and jitter can be eliminated between transfer times from the satellite to different regions. Equipment suitable for insertion of MIP frames, can properly insert the MIP frames in a flow whose flow is known and constant between the moment the flow is sent and the moment when the flow is received. However, it is not possible to use them in a contribution context. Indeed, the bit rate of the contribution signal may be different from the bit rate of the signal broadcast in a given geographical region, certain services may not concern certain regions. Since the bit rate is different between the signal transmitted on the contribution link and the signal received by the transmitters, the values included in the MIP frames inserted by a device adapted to the insertion of MIP frames are incorrect.

L'invention a notamment pour but de pallier les inconvénients précités. A cet effet, l'invention a pour objet un procédé de génération d'un signal de contribution optimisé comportant des multiplexes.The purpose of the invention is in particular to overcome the aforementioned drawbacks. To this end, the subject of the invention is a method for generating an optimized contribution signal comprising multiplexes.

Chaque multiplexe comporte des services à diffusion globale à destination d'une zone de couverture et une combinaison propre de servies régionaux à destination d'au moins une région géographique de ladite zone de couverture. Chaque multiplexe comporte des paquets de bourrage et des paquets transportant des tables de signalisations. Le signal de contribution optimisé est généré en :

  • conservant uniquement les services à diffusion globale différents les uns des autres ;
  • marquant les paquets de bourrage et les paquets transportant les tables de signalisations en fonction de leur multiplexe d'appartenance ;
  • construisant des rafales de données à partir des flux de données correspondant aux services à diffusion globale, aux services régionaux, et aux paquets de bourrage marqués et aux paquets marqués transportant les tables de signalisation,
  • insérant, avant la construction du signal de contribution optimisé, des informations de synchronisation sous forme de trames de synchronisation dans le signal de contribution optimisé, ledit signal de contribution optimisé étant reçu par au moins un récepteur présent dans une desdites région géographique, lesdits services régionaux étant extraits dudit signal de contribution optimisé et transmis à une pluralité de moyens de transmission couplés audit récepteur, lesdites informations de synchronisation ayant pour fonction d'accomplir la synchronisation entre lesdits moyens de transmission.
Each multiplex includes global broadcast services to a coverage area and a specific combination of regional services to at least one geographic region of the coverage area. Each multiplex includes stuffing packets and packets carrying signaling tables. The optimized contribution signal is generated in:
  • retaining only the global broadcast services that are different from each other;
  • marking the stuffing packets and the packets carrying the signaling tables according to their membership multiplex;
  • constructing data bursts from the data streams corresponding to the global broadcast services, the regional services, and the marked stuffing packets and tagged packets carrying the signaling tables,
  • inserting synchronization information in the form of synchronization frames in the optimized contribution signal before the construction of the optimized contribution signal, said optimized contribution signal being received by at least one receiver present in one of said geographical region, said regional services being extracted from said optimized contribution signal and transmitted to a plurality of transmission means coupled to said receiver, said timing information having the function of accomplishing synchronization between said transmitting means.

Dans un mode de réalisation, les paquets de bourrage et les paquets transportant les tables de signalisations sont marqués en opérant une translation de l'identifiant desdits paquets de bourrage et des paquets transportant les tables de signalisations.In one embodiment, the stuffing packets and the packets carrying the signaling tables are marked by operating a translation of the identifier of said stuffing packets and packets carrying the signaling tables.

Les rafales de données du signal de contribution optimisé peuvent être construites dans un premier temps pour tous les services à diffusion globale puis dans un second temps pour tous les services régionaux. Le signal de contribution optimisé peut comporter des rafales de données synchrones dont la période et le débit sont identiques.The data bursts of the optimized contribution signal can be constructed initially for all global broadcast services and then as a second step for all regional services. The optimized contribution signal may include synchronous data bursts whose period and rate are identical.

L'invention a aussi pour objet un procédé de démultiplexage. Pour une région géographique donnée, à partir d'un signal de contribution optimisé comportant des données relatives à au moins un multiplexe, chaque multiplexe comprenant des services à diffusion globale et régionales, des paquets de bourrage et des paquets transportant des tables de signalisation marqués en fonction de leur multiplexe d'appartenance, un signal est construit en :

  • ne conservant que les services destinés à ladite région géographique;
  • construisant des rafales de données à partir des flux de données compris dans le signal de contribution optimisé correspondant :
    • o aux services à diffusion globale ;
    • o aux services régionaux destinés à ladite région géographique;
    • o aux paquets de bourrage marqués et aux paquets marqués transportant les tables de signalisation correspondant aux services régionaux destinés à ladite région géographique.
The invention also relates to a demultiplexing method. For a given geographic region, from an optimized contribution signal having data relating to at least one multiplex, each multiplex comprising global broadcast and regional services, stuffing packets and packets carrying signal tables marked with according to their membership multiplex, a signal is built in:
  • keeping only the services intended for that geographical region;
  • constructing bursts of data from the data streams included in the corresponding optimized contribution signal:
    • o global broadcasting services;
    • o regional services for that geographical area;
    • o labeled jam packets and tagged packets carrying the signaling tables corresponding to the regional services intended for said geographic region.

Dans un mode de réalisation, au cours de l'étape de construction des rafales de données, l'identifiant des paquets de bourrage marqués et les paquets marqués transportant les tables de signalisations est translaté de manière à reconstituer lés flux de données correspondant aux services destinés à la région géographique.In one embodiment, during the step of constructing data bursts, the identifier of the marked stuffing packets and the marked packets carrying the signaling tables are translated so as to reconstitute the data streams corresponding to the services intended to the geographical area.

Le procédé peut aussi comporter une étape de lissage du débit du signal construit à l'étape de construction des rafales de données.The method may also include a step of smoothing the rate of the signal constructed in the step of constructing data bursts.

L'invention a encore pour objet un système de diffusion de services régionaux et de services à diffusion globale. Le système est apte à générer un signal de contribution optimisé comportant des multiplexes. Chaque multiplexe comporte les services à diffusion globale et une combinaison propre de services régionaux et chaque multiplexe comporte des paquets de bourrage et des paquets transportant des tables de signalisations. Le système est apte à diffuser certains services régionaux et à diffusion globale en rafales de données. Le signal de contribution est généré en :

  • conservant uniquement les services à diffusion globale différents les uns des autres ;
  • marquant les paquets de bourrage et les paquets transportant les tables de signalisations en fonction de leur multiplexe d'appartenance ;
  • construisant des rafales de données à partir des flux de données correspondant aux services à diffusion globale, aux services régionaux, et aux paquets de bourrage marqués et aux paquets marqués transportant les tables de signalisation,
  • insérant des informations de synchronisation dans le signal de contribution optimisé,
ledit système étant apte à mettre en oeuvre un procédé de génération de signal conforme au procédé de génération de signal selon l'invention.The invention also relates to a system for broadcasting regional services and global broadcast services. The system is capable of generating an optimized contribution signal comprising multiplexes. Each multiplex includes the global broadcast services and a clean combination of regional services and each multiplex includes stuffing packets and packets carrying signaling tables. The system is capable of broadcasting certain regional and broadcast services in bursts of data. The contribution signal is generated in:
  • retaining only the global broadcast services that are different from each other;
  • marking the stuffing packets and the packets carrying the signaling tables according to their membership multiplex;
  • constructing data bursts from the data streams corresponding to the global broadcast services, the regional services, and the marked stuffing packets and tagged packets carrying the signaling tables,
  • inserting synchronization information into the optimized contribution signal,
said system being able to implement a signal generation method according to the signal generation method according to the invention.

Dans un mode de réalisation, ledit système est prévu pour diffuser les multiplexes sur une zone de couverture comportant des régions géographiques. Chaque région géographique reçoit au moins un multiplexe. Le système comprend des récepteurs répartis dans différentes régions géographiques et aptes à recevoir ledit signal optimisé transmis dans la zone de couverture. Chaque récepteur est apte à générer à partir du signal de contribution optimisé un signal à émettre destiné à la région géographique dans laquelle ledit récepteur est situé. Le signal à émettre est transmis par des moyens de transmission sur l'ensemble de la région géographique dans laquelle les moyens de transmission se situent. Les moyens de transmission forment un réseau à fréquence unique et sont synchronisés. Au moins une partie desdits récepteurs sont destinés à mettre en oeuvre un procédé dé démultiplexage de signal conforme au procédé de démultiplexage de signal selon l'invention.In one embodiment, the system is provided for broadcasting the multiplexes over a coverage area including geographic regions. Each geographic region receives at least one multiplex. The system includes receivers distributed in different geographical regions and adapted to receive said transmitted optimized signal in the coverage area. Each receiver is able to generate from the optimized contribution signal a signal to be sent for the geographical region in which said receiver is located. The signal to be transmitted is transmitted by transmission means over the entire geographic region in which the transmission means are located. The transmission means form a single frequency network and are synchronized. At least a portion of said receivers are intended to implement a signal demultiplexing method according to the signal demultiplexing method according to the invention.

L'invention a encore pour objet un récepteur comportant une unité de traitement, une entrée et une sortie. L'entrée est prévue pour recevoir un signal de contribution optimisé comportant des données relatives à au moins un multiplexe. Chaque multiplexe comprend des services à diffusion globale et régionales, des paquets de bourrage et des paquets transportant des tables de signalisation marqués en fonction de leur multiplexe d'appartenance. L'unité de traitement est destiné à construire un signal envoyé sur la sortie en : - ne conservant que les services destinés à ladite région géographique; - construisant des rafales de données à partir des flux de données compris dans le signal de contribution optimisé correspondant : o aux services à diffusion globale ; o aux services régionaux destinés à ladite région géographique; o aux paquets de bourrage marqués et aux paquets marqués transportant les tables de signalisation correspondant aux services régionaux destinés à ladite région géographique.The invention also relates to a receiver comprising a processing unit, an input and an output. The input is provided to receive an optimized contribution signal including data relating to at least one multiplex. Each multiplex includes global broadcast and regional services, stuffing packets and packets carrying signal tables labeled according to their membership multiplex. The processing unit is intended to construct a signal sent on the output by: - retaining only the services intended for said geographical region; - constructing data bursts from the data streams included in the corresponding optimized contribution signal: o to global broadcast services; o regional services for that geographical area; o labeled jam packets and tagged packets carrying the signaling tables corresponding to the regional services intended for said geographic region.

Ledit récepteur est préférentiellement destiné à mettre en oeuvre un procédé de démultiplexage de signal conforme au procédé de démultiplexage de signal selon l'invention.Said receiver is preferably intended to implement a signal demultiplexing method according to the signal demultiplexing method according to the invention.

D'autres caractéristiques et avantages de l'invention apparaîtront à l'aide de la description qui suit faite en regard des dessins annexés qui représentent

  • la figure 1, une architecture du système de diffusion régionalisée de données selon l'invention ;
  • la figure 2a, les étapes mises en oeuvre par un procédé selon l'invention de génération d'un signal de contribution optimisé ;
  • la figure 2b, les différents flux de données avant et après la mise en oeuvre du procédé selon l'invention multiplexage des contributions ;
  • la figure 3a, les étapes mises en oeuvre par un procédé selon l'invention de démultiplexage des contributions ;
  • la figure 3b, le signal obtenu en sortie de l'étape de génération du multiplexe du procédé selon l'invention de démultiplexage des contributions ;
  • la figure 3c, le signal obtenu en sortie de l'étape de lissage du débit du procédé selon l'invention de démultiplexage des contributions ;
  • la figure 4, par un synoptique, un mode de réalisation du récepteur selon l'invention.
Other features and advantages of the invention will become apparent with the aid of the following description made with reference to the appended drawings which represent
  • the figure 1 an architecture of the regionalised data broadcasting system according to the invention;
  • the figure 2a the steps implemented by a method according to the invention for generating an optimized contribution signal;
  • the figure 2b , the different data streams before and after the implementation of the method according to the invention multiplexing contributions;
  • the figure 3a the steps implemented by a method according to the invention for demultiplexing the contributions;
  • the figure 3b the signal obtained at the output of the step of generating the multiplex of the method according to the invention for demultiplexing contributions;
  • the figure 3c the signal obtained at the output of the step of smoothing the flow rate of the method according to the invention of demultiplexing the contributions;
  • the figure 4 , by a synoptic, an embodiment of the receiver according to the invention.

La figure 1 représente une architecture du système de diffusion régionalisée de données selon l'invention. Le système de diffusion régionalisée de données selon l'invention comporte une partie dont une des fonctions est de générer un signal de contribution. Des sources de contenus 1 génèrent des flux de données. Les sources de contenus 1 peuvent par exemple être des serveurs de fichiers, des régies, des lecteurs ou tout autre équipement délivrant un contenu. Les flux de données générées peuvent être par exemple des flux de données IP. Les différents flux de données comportent différents services ou programmes. Parmi les services compris dans les,flux de données, on distingue des services régionaux 3 devant être diffusés seulement dans certaines régions géographiques 9 et des services à diffusion globale 2, comme par exemple des services nationaux. Un encapsulateur 4 reçoit les flux de données correspondant aux services régionaux 3 et aux services à diffusion globale 2. L'encapsulateur 4 reçoit les flux de données, par exemple les flux de données IP, et construit les signaux destinés à chacune des différentes régions géographiques 9. Le signal construit par l'encapsulateur 4 pour une région géographique 9 donnée est un signal multiplexé, appelé aussi multiplexe, comprenant l'ensemble des flux de données correspondant aux services régionaux 3 propres à cette région géographique 9 et aux services à diffusion globale 2.The figure 1 represents an architecture of the regionalised data broadcasting system according to the invention. The regionalized data broadcasting system according to the invention comprises a part whose function is to generate a contribution signal. Content sources 1 generate data streams. Content sources 1 may for example be file servers, control rooms, readers or any other equipment delivering content. The data streams generated may be for example IP data streams. The different data streams contain different services or programs. Among the services included in the data streams are regional services 3 to be broadcast only in certain geographic areas 9 and broadcast services 2, such as national services. An encapsulator 4 receives the data streams corresponding to the regional services 3 and the global broadcast services 2. The encapsulator 4 receives the data streams, for example the IP data streams, and constructs the signals intended for each of the different geographical regions. 9. The signal constructed by the encapsulator 4 for a given geographical region 9 is a multiplexed signal, also called a multiplexed signal, comprising all the data streams corresponding to the regional services 3 specific to this geographical region 9 and to the global broadcast services. 2.

L'encapsulateur 4 peut notamment prendre en charge la création des rafales de données successives pour l'ensemble des services régionaux 3 et à diffusion globale 2. Un flux de données émis en rafale comporte une alternance de phases d'émission d'un train de données suivies de phase de silence d'une durée connue à priori. L'envoi discontinu de données autorise les équipements recevant un flux de données émis en rafale à se mettre en veille lors des instants de silence, et à reprendre la réception un peu avant le début de réception du prochain train de données, mécanisme rendu possible par la connaissance de l'heure d'émission du prochain paquet. La norme DVB-H décrit un tel mode de fonctionnement, avec pour objectif d'économiser les sources d'énergie des récepteurs.The encapsulator 4 can in particular support the creation of successive data bursts for all regional services 3 and global broadcasting 2. A stream of data transmitted in a burst comprises alternating transmission phases of a train of data. data followed from phase of silence of a duration known a priori. The discontinuous sending of data allows the equipment receiving a stream of data transmitted in a burst to go to sleep during silent times, and to resume reception a little before the start of reception of the next data stream, mechanism made possible by knowledge of the time of issue of the next packet. The DVB-H standard describes such a mode of operation, with the objective of saving the energy sources of the receivers.

L'encapsulateur 4 peut se conformer aux exigences de la norme DVB-H. Les signaux destinés à chacune des différentes régions géographiques 9 comportent alors des services à diffusion en rafales de données. Il est en outre possible d'obtenir en sortie de l'encapsulateur 4 des signaux muitiplexés comportant à la fois des services à diffusion en rafales successives et des services à diffusion multiplexe. L'encapsulateur 4 peut encore avoir pour fonction de réorganiser avant la diffusion les différents signaux multiplexés de manière à optimiser la bande passante nécessaire.The encapsulator 4 can comply with the requirements of the DVB-H standard. The signals intended for each of the different geographical regions 9 then comprise burst data services. It is also possible to obtain at the output of the encapsulator 4 multiplexed signals comprising both successive burst broadcast services and multiplex broadcast services. The encapsulator 4 can still have the function of rearranging the various multiplexed signals before broadcasting in order to optimize the necessary bandwidth.

Dans un mode de réalisation, l'encapsulateur 4 peut encore insérer dans les différents signaux des trames comportant des informations de synchronisation à destination des équipements récepteurs. Par exemple, l'encapsulateur 4 peut insérer des trames MIP. Les trames MIP comportent les informations nécessaires pour accomplir la synchronisation entre les moyens de transmission 12. Des équipements, appelés MIP-Inserter, savent insérer correctement des trames MIP dans un flux. Cependant il n'est pas possible de les utiliser dans un contexte de contribution. C'est pourquoi la génération des trames MIP peut être implémentée au niveau de la construction des flux de données destinés aux différentes régions géographiques 9, avant la construction du signal de contribution. Cette implémentation est possible car l'encapsulateur 4 peut lui-même se synchroniser sur une horloge externe de type GPS. Comme le système de diffusion régionalisée de données selon l'invention assure l'intégrité des flux de données reçus dans chaque région géographique 9, les trames MIP seront toujours valides.In one embodiment, the encapsulator 4 can still insert in the different signals frames having synchronization information to the receiving equipment. For example, encapsulator 4 can insert MIP frames. The MIP frames contain the information necessary to complete the synchronization between the transmission means 12. Equipment, called MIP-Inserter, know how to correctly insert MIP frames in a stream. However, it is not possible to use them in a contribution context. This is why the generation of MIP frames can be implemented at the level of the construction of the data streams intended for the different geographical regions 9, before the construction of the contribution signal. This implementation is possible because the encapsulator 4 can itself be synchronized to an external clock type GPS. Since the region-based data delivery system of the invention ensures the integrity of the data streams received in each geographic region 9, the MIP frames will still be valid.

Les signaux multiplexés issues de l'encapsulateur 4 sont ensuite transmis à un modulateur 5 chargé d'adapter les signaux aux contraintes des canaux de transmission. Il peut par exemple moduler les signaux reçus avant de les transmettre à une antenne 6 pour diffusion vers un système satellitaire 8. Le système satellitaire 8 comporte un ou plusieurs satellites. Le signal transmis au système satellitaire 8 via l'antenne 6 est appelé signal de contribution 7. La bande passante disponible pour le signal de contribution 7 est particulièrement coûteuse et limitée. L'invention a notamment pour objet de réduire le besoin en bande passante nécessaire au signal de contribution 7.The multiplexed signals from the encapsulator 4 are then transmitted to a modulator 5 responsible for adapting the signals to the constraints of the transmission channels. It can for example modulate the received signals before transmitting them to an antenna 6 for broadcasting to a satellite system 8. The satellite system 8 comprises one or more satellites. The signal transmitted to the satellite system 8 via the antenna 6 is called the contribution signal 7. The bandwidth available for the contribution signal 7 is particularly expensive and limited. The object of the invention is in particular to reduce the bandwidth requirement for the contribution signal 7.

Le système satellitaire 8 diffuse sur une zone de couverture 10 le signal de contribution 7. La zone de courverture 10 comporte notamment plusieurs régions géographiques 9. Dans chaque région géographique 9 est présent au moins un récepteur 11 couplé à des moyens de transmission 12. Chaque récepteur 11 reçoit le signal en provenance du système satellitaire 8 et au besoin le démodule. Ce signal est identique dans la zone de couverture 10 pour tous les récepteurs 11, indépendamment de la région géographique 9 du site de réception. Le récepteur 11 extrait les services destinés à la région géographique 9 dans laquelle il est situé. Ainsi, les services extraits sont donc uniquement les services à diffusion globale 2 et les services régionaux 3 destinés à la région géographique 9 du récepteur 11. Les services extraits sont indifféremment des services à diffusion en rafales, des services à diffusion multiplexé ou une combinaison quelconque des deux types de services. Enfin, les flux de données correspondant aux services extraits peuvent être conformes à la norme DVB-H. Le récepteur 11 transmet les services extraits aux moyens de transmission 12. Les moyens de transmission 12 ont pour fonction de diffuser les services extraits sur l'ensemble de leur région géographique 9. Les moyens de transmission 12 peuvent notamment être des émetteurs hyperfréquences réparties sur l'ensemble de la région géographique 9. Les moyens de transmission 12 peuvent former un réseau à fréquence unique (ou selon l'expression anglosaxonne Single Frequency Network). Les moyens de transmission 12 de la zone de couverture 10 doivent alors être synchronisés afin d'exclure les interférences mutuelles. Pour ce faire, les moyens de transmission 12 se synchronisent grâce aux trames MIP générées par exemple par l'encapsulateur 4. Les trames MIP comportent les informations nécessaires pour accomplir la synchronisation entre les moyens de transmission 12.The satellite system 8 broadcasts on a coverage area 10 the contribution signal 7. The coverage zone 10 comprises in particular several geographical regions 9. In each geographic region 9 is present at least one receiver 11 coupled to transmission means 12. Each receiver 11 receives the signal from the satellite system 8 and if necessary the demodule. This signal is identical in the coverage area 10 for all the receivers 11, regardless of the geographical region 9 of the reception site. The receiver 11 extracts the services intended for the geographic region 9 in which it is located. Thus, the services extracted are therefore only the global broadcast services 2 and the regional services 3 intended for the geographical region 9 of the receiver 11. The extracted services are indifferently bursty services, multiplexed broadcast services or any combination whatsoever both types of services. Finally, the data streams corresponding to the services extracted may conform to the DVB-H standard. The receiver 11 transmits the extracted services to the transmission means 12. The transmission means 12 have the function of broadcasting the extracted services over their entire geographic region 9. The transmission means 12 may in particular be microwave transmitters distributed over the region. The whole of the geographical region 9. The transmission means 12 may form a single frequency network (or the Anglesaxonne Single Frequency Network). The transmission means 12 of the coverage area 10 must then be synchronized in order to exclude mutual interference. To do this, the transmission means 12 synchronize using the MIP frames generated for example by the encapsulator 4. The MIP frames contain the information necessary to accomplish the synchronization between the transmission means 12.

La figure 1 illustre une architecture du système de diffusion régionalisée de données selon l'invention mettant en oeuvre un signal de contribution 7 diffusée par un système satellitaire 8. Cependant, tout autre moyen de diffusion dont la bande passante doit être optimisée peut être employé pour remplir cette fonction.The figure 1 illustrates an architecture of the regionalized data broadcasting system according to the invention implementing a signal of contribution 7 broadcast by a satellite system 8. However, any other broadcasting medium whose bandwidth needs to be optimized can be used to fulfill this function.

La figure 2a montre les étapes mises en oeuvre par un procédé selon l'invention de génération d'un signal de contribution optimisé. La figure 2b montre les différents flux de données avant et après la mise en oeuvre du procédé selon l'invention de multiplexage des contributions. Les éléments identiques aux éléments déjà présentés sur les autres figures portent les mêmes références. Le procédé selon l'invention peut notamment être mis en oeuvre dans la partie d'un système de diffusion régionalisée de données selon l'invention dont une des fonctions est de générer un signal de contribution optimisé.The figure 2a shows the steps implemented by a method according to the invention for generating an optimized contribution signal. The figure 2b shows the different data streams before and after the implementation of the method according to the invention for multiplexing contributions. Elements identical to the elements already presented in the other figures bear the same references. The method according to the invention can in particular be implemented in the part of a regionalised data broadcasting system according to the invention, one of whose functions is to generate an optimized contribution signal.

Le procédé selon l'invention de génération d'un signal de contribution optimisé reçoit en entrée au moins un service à diffusion globale 2 et des services régionaux 3. On appelle par la suite multiplexe 35 le signal comportant l'ensemble des services à diffusion globale 2 et des services régionaux 3 destinés à une région géographique 9 donnée. Le procédé selon l'invention reçoit pour chaque région géographique 9 un multiplexe 35. Le procédé selon l'invention délivre en sortie un signal de contribution optimisé 36. La figure 2b illustre le cas où le procédé selon l'invention reçoit en entrée trois multiplexes 35 et délivre en sortie un signal de contribution optimisé 35. Sur la figure 2b, les diagrammes de flux de données comportent un axe des abscisses 21 représentant le temps et un axe des ordonnées 20 représentant le débit des flux de données. Le procédé selon l'invention de multiplexage des contributions a notamment pour objet de réduire la bande passante nécessaire pour diffuser les services régionaux des différentes régions 9 et de délivrer un signal de contribution optimisé 36 à partir duquel chaque récepteur 11 peut retrouver les services régionaux 3 qui lui sont destinés. Or les contraintes liées notamment à la diffusion de services répondant à la norme DVB-H imposent de respecter une synchronisation entre l'émetteur et le récepteur du service ne tolérant pas la moindre insertion ou suppression de bit d'information dans le signal.The method according to the invention for generating an optimized contribution signal receives in input at least one global broadcast service 2 and regional services 3. The multiplexed signal 35 is then called the set of all global broadcast services. 2 and regional services 3 for a given geographic area. The method according to the invention receives for each geographical region 9 a multiplex 35. The method according to the invention delivers an optimized contribution signal 36 at the output. figure 2b illustrates the case where the method according to the invention receives at input three multiplexes 35 and outputs an optimized contribution signal 35. figure 2b the data flow charts include an x-axis 21 representing the time and an ordinate axis 20 representing the flow rate of the data streams. The method according to the invention for multiplexing contributions is intended in particular to reduce the bandwidth required to broadcast the regional services of the different regions 9 and to deliver an optimized contribution signal 36 from which each receiver 11 can find the regional services 3 which are intended for him. But the constraints related in particular to the broadcast of services meeting the DVB-H standard require to respect a synchronization between the transmitter and the receiver of the service does not tolerate any insertion or removal of information bits in the signal.

Dans une étape 30 du procédé selon l'invention, les services à diffusion globale 2 redondants sont supprimés. Pour chaque service à diffusion globale 2, on ne conserve qu'un seul flux de données. En effet, par définition les services à diffusion globale 2 sont présents dans chaque multiplexe 35. L'étape 30 de suppression des redondances des services à diffusion globale 2 permet de ne conserver dans le signal de contribution optimisé 36 que les services à diffusion globale 2 différents les uns des autres. Aussi, sur la figure 2b, il existe trois multiplexes 35 :

  • un premier multiplexe 35 comportant un service à diffusion globale 22 et un service régional 23 diffusé en rafale,
  • un second multiplexe 35 comportant le service à diffusion global 22 et un service régional 24 diffusé en rafale ;
  • un troisième multiplexe 35 comportant le service à diffusion globale 22 et un service régional 25 diffusé en rafale.
In a step 30 of the method according to the invention, redundant global broadcasting services 2 are suppressed. For each service to global broadcast 2, only one data stream is kept. Indeed, by definition, the global broadcast services 2 are present in each multiplex 35. The step 30 of eliminating the redundancies of the global broadcast services 2 makes it possible to keep in the optimized contribution signal 36 only the services with global diffusion 2 different from each other. Also, on the figure 2b there are three multiplexes 35:
  • a first multiplex 35 comprising a broadcast service 22 and a burst regional service 23,
  • a second multiplex 35 comprising the global broadcast service 22 and a burst regional service 24;
  • a third multiplex 35 comprising the global broadcast service 22 and a burst regional service.

A l'issue du procédé selon l'invention, et notamment à la sortie de l'étape 30, le signal de contribution optimisé 36 ne comporte qu'un flux de données correspondant au service à diffusion globale 22.
Afin de conserver un débit constant, les flux de données supportant les services comportent des paquets de bourrage. Ces paquets de bourrage permettent de transmettre un flux avec un débit connu, permettant aux récepteurs 11 de se repérer temporellement. Ces paquets de bourrage sont propres à un multiplexe 35 donné. De plus, les flux de données supportant les services, comportent des tables de signalisation propre à chaque multiplexe 35. Aussi, comme illustré sur la figure 2b :

  • le premier multiplexe 35 comporte des paquets de bourrage et des paquets transportant les tables de signalisation 26 ;
  • le second multiplexe 35 comporte des paquets de bourrage et des paquets transportant les tables de signalisation 27 ;
  • le troisième multiplexe 35 comporte des paquets de bourrage et des paquets transportant les tables de signalisation 28.
Le flux de données supportant les services à diffusion globale 22 comporte aussi des paquets transportant les tables de signalisation 29.At the end of the method according to the invention, and in particular at the output of step 30, the optimized contribution signal 36 comprises only one data stream corresponding to the global broadcast service 22.
In order to maintain a constant throughput, the data streams supporting the services include stuffing packets. These stuffing packets make it possible to transmit a stream with a known throughput, allowing the receivers 11 to locate themselves temporally. These stuffing packs are specific to a given multiplex. In addition, the data streams supporting the services include signal tables specific to each multiplex 35. Also, as illustrated in FIG. figure 2b :
  • the first multiplex 35 comprises stuffing packets and packets carrying the signaling tables 26;
  • the second multiplex 35 comprises stuffing packets and packets carrying the signaling tables 27;
  • the third multiplex 35 comprises stuffing packets and packets carrying the signaling tables 28.
The data stream supporting the global broadcast services 22 also includes packets carrying the signaling tables 29.

La figure 2b montre un cas où le débit des paquets de bourrage est constant. Cependant, le débit peut être variable au cours du temps et différent d'un multiplexe 35 à l'autre.The figure 2b shows a case where the rate of stuffing packets is constant. However, the rate may be variable over time and different from one multiplex to another.

Dans une étape 31 de marquage des paquets de bourrage, les paquets de bourrage 26,27,28 sont marqués en fonction de leur multiplexe 35 d'appartenance. Cette opération a pour fonction d'associer un paquet de bourrage 26, 27, 28 à un multiplexe 35 donné. Cette opération peut par exemple être mise en oeuvre en opérant une translation de l'identifiant Pid des paquets de bourrage 26, 27, 28.In a step 31 for marking stuffing packets, the stuffing packs 26,27,28 are marked according to their multiplex 35 of belonging. This operation serves to associate a stuffing packet 26, 27, 28 to a given multiplex 35. This operation can for example be implemented by operating a translation of the identifier Pid of the stuffing packets 26, 27, 28.

Dans une étape 32 de marquage des paquets transportant les tables de signalisations, les paquets transportant les tables de signalisation 26,27,28 sont marqués en fonction de leur multiplexe 35 d'appartenance. Cette opération a pour fonction d'associer des paquets transportant les tables de signalisation 26,27,28. à un multiplexe 35 donné. Cette opération peut par exempte être mise en oeuvre en opérant une translation de l'identifiant Pid des paquets transportant les tables de signalisation 26,27,28.In a step 32 for marking the packets carrying the signaling tables, the packets carrying the signaling tables 26, 27, 28 are labeled according to their membership multiplex. This operation serves to associate packets carrying the signaling tables 26,27,28. at a given multiplex 35. This operation may for example be implemented by performing a translation of the identifier Pid of the packets carrying the signaling tables 26,27,28.

Dans une étape 33 de génération du signal de contribution optimisé, un flux de données est construit notamment à partir des flux de données générés aux étapes 30, 31 et 32. Le flux de données comporte notamment un flux de données correspondant au service à diffusion globale 22, aux rafales de données correspondant aux services régionaux 23, 24 et 25, aux paquets de bourrage marqués et les paquets marqués transportant les tables de signalisation 26,27,28. La bande passante restante peut être remplie par des paquets de bourrage 30, notamment si les services régionaux 23, 24, 25 n'ont pas des débits identiques. La génération 33 du signal de contribution optimisé 36 regroupe les services selon qu'ils sont régionaux 3 ou à diffusion globale 2. Ainsi, pour chaque rafale, le service à diffusion globale 22 est transmis avant les services régionaux 23, 24 et 25. De plus, le signal de contribution optimisé 36 comporte des rafales de données synchrones dont la période et le débit sont identiques. Aussi, la période et le débit des rafales de données correspondant aux services régionaux 23, 24 et 25 sont identiques. De plus, les rafales de données correspondant aux services régionaux 23, 24 et 25 sont synchrones : elles sont transmises au même instant. En outre, le débit de génération de chaque multiplexe 35 doit correspondre au débit d'émission par les moyens de transmission 12 sur le réseau terrestre.In a step 33 of generation of the optimized contribution signal, a data flow is constructed in particular from the data streams generated in steps 30, 31 and 32. The data flow notably comprises a data flow corresponding to the global broadcast service. 22, burst of data corresponding to the regional services 23, 24 and 25, labeled jam packets and tagged packets carrying the signaling tables 26,27,28. The remaining bandwidth can be filled by stuffing packs 30, especially if the regional services 23, 24, 25 do not have identical rates. The generation of the optimized contribution signal 36 groups the services according to whether they are regional 3 or global broadcast 2. Thus, for each burst, the global broadcast service 22 is transmitted before the regional services 23, 24 and 25. further, the optimized contribution signal 36 includes synchronous data bursts whose period and rate are identical. Also, the period and the data burst rate corresponding to the regional services 23, 24 and 25 are identical. In addition, the burst of data corresponding to the regional services 23, 24 and 25 are synchronous: they are transmitted at the same time. In addition, the generation rate of each multiplex 35 must correspond to the transmission rate by the transmission means 12 on the terrestrial network.

Dans un mode de réalisation, au cours de l'étape 33 de génération du signal de contribution optimisé, des informations de synchronisation sont introduites dans le signal de contribution optimisé 36. Ces informations de synchronisation peuvent par exemple prendre la forme de trames MIP. Les trames MIP comportent les informations nécessaires pour accomplir la synchronisation entraxes moyens de transmission 12 notamment.In one embodiment, during step 33 of generating the optimized contribution signal, synchronization information is introduced into the optimized contribution signal 36. This synchronization information can for example take the form of MIP frames. The MIP frames contain the information necessary to accomplish the synchronization between transmission means 12 including.

La figure 3a montre les étapes mises en oeuvre par un procédé selon l'invention de démultiplexage des contributions. Les éléments identiques aux éléments déjà présentés sur les autres figures portent les mêmes références.The figure 3a shows the steps implemented by a method according to the invention of demultiplexing contributions. Elements identical to the elements already presented in the other figures bear the same references.

Un des rôles des récepteurs 11 est d'extraire à partir du signal de contribution optimisé 36 le multiplexe 35 original destiné à leur région géographique 9. Le procédé selon l'invention de démultiplexage des contributions peut notamment être mis en oeuvre dans chaque récepteur 11 recevant un signal de contribution optimisé 36 généré par un procédé selon l'invention de multiplexage des contributions.One of the roles of the receivers 11 is to extract from the optimized contribution signal 36 the original multiplex 35 intended for their geographical region 9. The method according to the invention of demultiplexing the contributions may notably be implemented in each receiver 11 receiving an optimized contribution signal 36 generated by a method according to the invention for multiplexing contributions.

Dans une première étape 40, le procédé selon l'invention de démultiplexage des contributions reçoit le signal de contribution optimisé 36. Le signal de contribution optimisé 36 comporte l'ensemble des services régionaux 23, 24, 25 et à diffusion globale 22.In a first step 40, the method according to the invention for demultiplexing the contributions receives the optimized contribution signal 36. The optimized contribution signal 36 comprises all the regional services 23, 24, 25 and global distribution 22.

Dans une étape 41, le signal de contribution optimisé 36 est filtré afin de ne conserver que les services destinés à une région géographique 9 donnée. Les paquets qui ne sont pas destinées à la région géographique 9, à laquelle appartient le récepteur 11, sont supprimés. Les paquets de bourrage non marqués sont aussi supprimés.In a step 41, the optimized contribution signal 36 is filtered in order to keep only the services intended for a given geographic region 9. Packets that are not intended for the geographic region 9, to which the receiver 11 belongs, are deleted. Unmarked jam packets are also deleted.

Dans une étape 42, le multiplexe 35 est régénéré. Pour cela, il est nécessaire non seulement de reconstituer les flux de données correspondant aux services destinés à une région géographique 9 donnée, mais aussi de reconstruire les paquets de bourrage et les paquets transportant les tables de signalisation propre à un multiplexe donné 35. Pour cela, on peut par exemple, translater, de manière opposée à l'étape 31 et 32 du procédé Selon l'invention de multiplexage des contributions, l'identifiant Pid des paquets de bourrage et des paquets transportant les tables de signalisation 26,27,28 en fonction de leur multiplexe 35 d'appartenance.In a step 42, the multiplex 35 is regenerated. For this, it is necessary not only to reconstitute the data flows corresponding to the services intended for a given geographic region 9, but also to reconstruct the packets of stuffing and the packets carrying the signaling tables specific to a given multiplex. it is possible, for example, to translate, in the opposite manner to the stage 31 and 32 of the method according to the invention of multiplexing the contributions, the identifier Pid of the stuffing packets and the packets carrying the signaling tables 26,27,28 according to their membership multiplex.

La figure 3b illustre le signal obtenu en sortie de l'étape 42 de génération du multiplexe du procédé selon l'invention de démultiplexage des contributions. Les éléments identiques aux éléments déjà présentés sur les autres figures portent les mêmes références. Sur la figure 3b, le diagramme de flux de données comporte un axe des abscisses 21 représentant le temps et un axe des ordonnées 20 représentant le débit des flux de données. Le signal comporte:

  • le service à diffusion globale 22 et les paquets correspondant transportant les tables de signalisation 29 ;
  • le service régional 25 ainsi les paquets de bourrage et des paquets transportant les tables de signalisation 28.
Le débit du service à diffusion globale 22 est généralement plus important que le débit du service régional 25.The figure 3b illustrates the signal obtained at the output of step 42 for generating the multiplex of the method according to the invention for demultiplexing contributions. Elements identical to the elements already presented in the other figures bear the same references. On the figure 3b , the diagram The data flow includes an x-axis 21 representing the time and an ordinate axis 20 representing the flow rate of the data streams. The signal comprises:
  • the global broadcast service 22 and the corresponding packets carrying the signaling tables 29;
  • the regional service 25 and stuffing packets and packets carrying the signaling tables 28.
The throughput of the global broadcast service 22 is generally larger than the throughput of the EAS 25.

Or le débit auquel sont reçus les services à diffusion globale 2 est généralement supérieur au débit des moyens de transmission 12. Dans une étape 42, le débit du signal à émettre 46 est lissé.However, the bit rate at which the global broadcast services 2 are received is generally greater than the bit rate of the transmission means 12. In a step 42, the bit rate of the signal to be transmitted 46 is smoothed.

La figure 3c illustre le signal 46 obtenu en sortie de l'étape 43 de lissage du débit du procédé selon l'invention de démultiplexage des contributions. Les éléments identiques aux éléments déjà présentés sur les autres figures portent les mêmes références. Sur la figure 3b, le diagramme de flux de données comporte un axe des abscisses 21 représentant le temps et un axe des ordonnées 20 représentant le débit des flux de données. Le signal comporte :

  • le service à diffusion globale 22 et les paquets correspondant transportant les tables de signalisation 29 ;
  • le service régional 25 ainsi les paquets de bourrage et des paquets transportant les tables de signalisation 28.
A la différence du signal en sortie de l'étape 42 de génération du multiplexe du procédé selon l'invention de démultiplexage des contributions, le débit est sensiblement constant au cours du temps, quel que soit le type de service (régional 3 ou à diffusion globale 2) à transmettre.The figure 3c illustrates the signal 46 obtained at the output of step 43 smoothing the flow of the method according to the invention of demultiplexing contributions. Elements identical to the elements already presented in the other figures bear the same references. On the figure 3b the data flow diagram includes an abscissa axis 21 representing the time and an ordinate axis 20 representing the flow rate of the data streams. The signal comprises:
  • the global broadcast service 22 and the corresponding packets carrying the signaling tables 29;
  • the regional service 25 and stuffing packets and packets carrying the signaling tables 28.
Unlike the signal at the output of step 42 for generating the multiplex of the method according to the invention for demultiplexing contributions, the bit rate is substantially constant over time, regardless of the type of service (regional 3 or broadcast 2) to be transmitted.

L'opération 43 de lissage du débit peut être mise en oeuvre par l'intermédiaire de tampons de données permettant d'absorber et de lisser le débit fluctuant de paquets.The flow smoothing operation 43 may be implemented via data buffers to absorb and smooth the fluctuating flow rate of packets.

Dans une étape 44, le signal 46 obtenu en sortie de l'étape 43 de lissage du débit du procédé selon l'invention de démultiplexage des contributions est ensuite ré-émis localement, c'est-à-dire dans la zone géographique 9 des moyens de transmission 12.In a step 44, the signal 46 obtained at the output of step 43 smoothing the flow of the method according to the invention for demultiplexing the contributions is then re-transmitted locally, that is to say in the geographical area 9 of the transmission means 12.

Dans un mode de réalisation, les étapes 41, 42, 43 du procédé selon l'invention de réception et de régénération d'un multiplexe 35 sont réalisées par un modulateur DVB-H, utilisé par exemple par les moyens de transmission 12. On constate donc que le récepteur 11 n'a, en dehors de la réception satellite pure, que des tâches très simples à effectuer et peu de besoin en mémoire. L'intégration de ces fonctions dans un modulateur DVB-H permet donc de simplifier le récepteur 11.In one embodiment, the steps 41, 42, 43 of the method according to the invention for receiving and regenerating a multiplex 35 are carried out by a DVB-H modulator, used for example by the transmission means 12. so that the receiver 11 has, apart from pure satellite reception, only very simple tasks to perform and little need in memory. The integration of these functions in a DVB-H modulator makes it possible to simplify the receiver 11.

La figure 4 illustre par un synoptique un mode de réalisation du récepteur 11 selon l'invention. Les éléments-identiques aux éléments déjà présentés sur les autres figures portent les mêmes références. Le récepteur 11 comporte notamment une unité de traitement 61. L'unité de traitement 61 peut être une carte électronique comportant un ou plusieurs microprocesseurs, un composant à logique programmable, ou tout autre dispositif adapté notamment aux calculs numériques.The figure 4 illustrates by a block diagram an embodiment of the receiver 11 according to the invention. The elements identical to the elements already presented in the other figures bear the same references. The receiver 11 comprises in particular a processing unit 61. The processing unit 61 may be an electronic card comprising one or more microprocessors, a programmable logic component, or any other device adapted in particular to numerical calculations.

Le récepteur 11 reçoit sur une entrée 60 un signal de contribution optimisé 36 comportant des données relatives à au moins un multiplexe 35. Chaque multiplexe comprend des services à diffusion globale 22 et régionales 23, 24 et 25, des paquets de bourrage et des paquets transportant des tables de signalisation 26,27,28 marqués en fonction de leur multiplexe d'appartenance. L'unité de traitement 61 du récepteur 11 construit un signal envoyé sur une sortie 62 en mettant en oeuvre les étapes du procédé selon l'invention dé démultiplexage des contributions (illustré notamment par la figure 3a). La sortie 62 peut être notamment connecté aux moyens de transmission 12.The receiver 11 receives on an input 60 an optimized contribution signal 36 comprising data relating to at least one multiplex 35. Each multiplex comprises global broadcast services 22 and regional 23, 24 and 25, packets of stuffing and packets carrying signaling tables 26,27,28 labeled according to their membership multiplex. The processing unit 61 of the receiver 11 constructs a signal sent on an output 62 by implementing the steps of the method according to the invention of demultiplexing the contributions (illustrated in particular by the figure 3a ). The output 62 may in particular be connected to the transmission means 12.

Claims (10)

  1. Method for generating an optimised contribution signal (36) comprising multiplexes (35), each multiplex (35) comprising global broadcasting services (22) intended for a coverage area (10) and an own combination of regional services (23, 24, 25) intended for at least one geographic region (9) of said coverage area, each multiplex (35) comprising stuffing packets and packets transporting signalling tables (26, 27, 28) characterised in that the optimised contribution signal (36) is generated by an encapsulator (4) by:
    - retaining (30) only the global broadcasting services (22) which are different from one another;
    - marking (31 ,32) the stuffing packets and the packets transporting the signalling tables (26, 27, 28) according to the multiplex (35) to which they belong;
    - constructing (33) data bursts from the data streams corresponding to the global broadcasting services (22), to the regional services (23, 24, 25), and to the marked stuffing packets and to the marked packets transporting the signalling tables (26, 27, 28),
    - inserting, before the construction of the optimised contribution signal (36), synchronisation information in the form of synchronisation frames into the optimised contribution signal (36), said optimised contribution signal (36) being received by at least one receiver (11) present in one of said geographic regions (9), said regional service (23,24,25) being extracted from said optimised contribution signal (36) and transmitted to a plurality of transmission means (12) coupled to said receiver (11), the function of said synchronisation information being to accomplish the synchronisation between said transmission means (12).
  2. Method according to claim 1 characterised in that the stuffing packets and the packets transporting the signalling tables (26, 27, 28) are marked (31, 32) by applying a translation of the identifier (Pid) of said stuffing packets and of the packets transporting the signalling tables (26, 27, 28).
  3. Method according to any one of the preceding claims characterised in that the data bursts of the optimised contribution signal (36) are constructed (33) firstly for all the global broadcasting services (22) then secondly for all the regional services (23, 24, 25).
  4. Method according to any one of the preceding claims characterised in that the optimised contribution signal (36) comprises synchronous data bursts with identical period and bit rate.
  5. Demultiplexing method characterised in that, for a given geographic region (9), from an optimised contribution signal (36) obtained by executing the steps of the method according to any one of claims 1 to 5 and comprising data relating to at least one multiplex (35), each multiplex (35) comprising global broadcasting services (22) and regional broadcasting services (23, 24 and 25), stuffing packets and packets transporting signalling tables (26,27,28) marked according to the multiplex to which they belong, a signal is constructed by:
    - retaining (41) only the services intended for said geographic region (9);
    - constructing (42) data bursts from the data streams comprised in the optimised contribution signal (36) corresponding:
    o to the global broadcasting services (22);
    o to the regional services (23, 24, 25) intended for said geographic region (9);
    o to the marked stuffing packets and to the marked packets transporting the signalling tables (26, 27, 28) corresponding to the regional services (23, 24, 25) intended for said geographic region (9).
  6. Method according to claim 5 characterised in that during the data burst construction step (42), the identifier (Pid) of the marked stuffing packets and the marked packets transporting the signalling tables (26, 27, 28) is translated so as to reconstruct the data streams corresponding to the services intended for the geographic region (9).
  7. Method according to one of claims 5 or 6 characterised in that it comprises a step (43) for smoothing the bit rate of the signal (36) constructed in the data burst construction step (42).
  8. System for broadcasting regional services (23, 24, 25) and global broadcasting services (22), said system comprising an encapsulator intended to generate an optimised contribution signal (36) comprising multiplexes (35), each multiplex (35) comprising the global broadcasting services (22) and an own combination of regional services (23, 24, 25) and each multiplex (35) comprising stuffing packets and packets transporting signalling tables (26, 27, 28), characterised in that said system is able to broadcast certain regional services (23, 24, 25) and global broadcasting services (22) in data bursts, the contribution signal being generated by executing the steps of the method according to any one of claims 1 to 4.
  9. Broadcasting system according to claim 8, characterised in that said system being designed to broadcast the multiplexes (35) over a coverage area (10) comprising geographic regions (9) and each geographic region (9) receiving at least one multiplex (35), said system comprises receivers (11) distributed over various geographic regions (9) and intended to receive said optimised signal transmitted in the coverage area (10), each receiver (11) being intended to generate from the optimised contribution signal (36) a signal to be transmitted intended for the geographic region (9) in which said receiver (11) is located, the signal to be transmitted being transmitted by transmission means (12) to the whole geographic region (9) in which the transmission means (12) are located, the transmission means (12) forming a single-frequency network and being synchronised, at least some of said receivers (11) being intended to implement the demultiplexing method in accordance with any one of claims 5 to 7.
  10. Receiver (11) comprising a processing unit (61), an input (60) and an output (62), characterised in that the input (60) being designed to receive an optimised contribution signal (36) obtained by executing the steps of the method according to any one of claims 1 to 4 and comprising data relating to at least one multiplex (35), each multiplex (35) comprising global broadcasting services (22) and regional services (23, 24 and 25), stuffing packets and packets transporting signalling tables (26, 27, 28) marked according to the multiplex (35) to which they belong, the processing unit (61) is intended to construct a signal sent to the output (62) obtained by implementing the demultiplexing method in accordance with any one of claims 5 to 7.
EP06819076.8A 2005-10-14 2006-10-13 Method for generating and demultiplexing an optimized contributing signal, and regionalized data broadcasting system Expired - Fee Related EP1943807B1 (en)

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FR0510510A FR2892253B1 (en) 2005-10-14 2005-10-14 METHOD FOR GENERATING AND DEMULTIPLEXING AN OPTIMIZED CONTRIBUTION SIGNAL, AND SYSTEM FOR REGIONALIZED DIFFUSION OF DATA.
PCT/EP2006/067400 WO2007042574A1 (en) 2005-10-14 2006-10-13 Method for generating and demultiplexing an optimized contributing signal, and regionalized data broadcasting system

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